 |
| Titel |
Storm damage in the Black Forest caused by the winter storm "Lothar" – Part 1: Airborne damage assessment |
| VerfasserIn |
J. Schmoeckel, C. Kottmeier |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1561-8633
|
| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 8, no. 4 ; Nr. 8, no. 4 (2008-08-01), S.795-803 |
| Datensatznummer |
250005652
|
| Publikation (Nr.) |
 copernicus.org/nhess-8-795-2008.pdf |
|
|
|
|
|
| Zusammenfassung |
| An airborne survey of the Black Forest as affected by the winter storm
"Lothar" in 1999 is performed by means of a color line scanner (CLS) with
a CCD sensor, whose data in a visible and a near-infrared channel
provide the Normalized Difference Vegetation Index (NDVI) as a measure
of the damage in previously intact forest areas. The camera data, height data
from a digital evelation model (DEM), land use information, and soil
data are
georeferenced and processed in a geographic information system (GIS) to
derive relationship of the damage
pattern to the characteristics of the local orography and soil types.
The data cover an area of 4900 km2, 2767 km2 of which were forested.
The 363 detected storm damage areas with a minimum detection size of 1.5 ha
amount to 0.8% of the total forest area. Visual inspections at certain sites
prove that none of the larger damage areas are missed, but areas smaller
than 1.5 ha cause the total damage area to be up to twice our result,
i.e. ≈1.6% of the forest area. More than 50% of the
detected damaged areas are smaller than 5 ha and most of them have a
size ranging from 1.5 to 3.5 ha. Forests on slopes with an
inclination angle between 10 and 15 degrees show the highest fraction
of damaged forest, doubling those on plains and below 5 degrees
inclination angle.
Forests on northwestern slopes are more affected than those on
southwestern and western slopes, which faced the wind during highest
wind speed occurrence. In contrast to other studies, this paper shows,
that in steep areas, lee slopes are more damaged than the luv
slopes. As expected, wet to moist soils represent an
unstable location for the trees. But also medium-dry to dry locations
that were considered to be relatively stable exhibited a highly
damaged forest fraction. This can be attributed to mostly saturated
soil from previous rain. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|